use django.utils.timezone for defaults instead of datetime
django.utils.timezone requires Django 1.4
Merge branch 'master' of git://github.com/fdemmer/django-friendship into fdemmer-master
removed testing for django 1.3
added compatibility note to the read me
version bump
Merge pull request #9 from revsys/fdemmer-master

RuntimeWarning: ...naive datetime
PEP8 cleanups